I bought another truck a week ago. '02 ccsb Lariat 4WD. The morning after I got it it started hard (took about 6 seconds or so to fire). the second morning it didn't start at all. hooked up my infinity and my voltage was fluctuating from 4.5 to 11.5 with glow plugs energized. found the GPR was bad, then found batteries were bad.
Installed new GPR, napa legend batteries, oil change with shell 5-40 synthetic.
Ohmed the glow plugs through the valve cover connector, they were all at 1 ohm. Noticed my AIH looked like something had melted on it and realized some one had it apart and put both wires on the same side of the insulator and part of the insulation had melted so I fixed that too.
Also ohmed from the GPR to the plug for the uvch, and ohmed the AIH, everything was at 1 ohm.

According to my Infinity it should start
RPM - 170
volts - 10.62
pulse width - 4.752
ICP -2071
IPRDC - 39%
EOT - 32deg

plugged it in for half hour or so and it started. Though it took a few seconds.
RPM - 178
Volts - 10.62
Pulse width - 4.056
ICP - 2344
IPRDC - 38.4
EOT - 54deg

My map is off from Baro and EP by about 2psi but I think it should start.
I'm starting to think Injectors as it has original injectors and has 330k on the truck. It is stock other than AFE cold air intake and 4" exhaust. also came with a hand held tuner, super ship I think, but I put the stock tune back in when i started having problems.
So is there something else I can check to make sure it is the injectors or not? Thanks

 

Also I ran all the tests I can with the infinity and everything came back ok. buzz, KOEO, ect. The cyl contribution showed 8, 3, and 1. but I think it showed the same on my other truck and it will start down into the teens.

 

Good post. Very informative. I like the precision and the step-by-step methodology in your troubleshooting. Good luck to you!

 

I hate to say this but you participated in my cold start thread last year. You know what this is starting to point to...

 

Yeah. Had an idea when I bought it would probably need injectors before to long. Got it cheap enough I can justify putting some money into it. Just wanted to make sure I wasn't missing something before I spent the money.

 

Dan found a set of BRAND NEW 160cc AC's for $999. That is a screaming deal.

https://www.facebook.com/VisionDieselPerformance

 

Thanks. I'll have to check that out.